RU62723U1 - LABEL FOR RADIO FREQUENCY IDENTIFICATION OF OBJECTS - Google Patents

Abstract

The label for radio-frequency identification of objects refers to radio engineering and is intended for radio-frequency identification of objects (goods of structural products, etc.) for various purposes and for obtaining various information about them. The technical result is to increase manufacturability, reduce material consumption, reduce overall dimensions. The achievement of the above technical result is ensured by the fact that the label for radio-frequency identification of objects contains an identification microcircuit and a microstrip antenna connected to it, comprising a lower conductive layer, an upper conductive layer and a dielectric layer located between them, the identification microcircuit being connected directly to the upper and lower conductive leads layers, the integrated resistance of the identification chip is located in the range (10 ÷ 30) -j (410 ÷ 430 ) Ohm and is consistent with the complex resistance of the microstrip antenna in the range of 0.86 ÷ 0.9 of its resonant frequency, and the working frequency range of the mark is 865 ÷ 869.65 MHz.

Description

The utility model relates to radio engineering and is intended for radio-frequency identification of objects (goods, products, structures, etc.) for various purposes and for obtaining various information about them.

A known label for radio-frequency identification of objects containing an identification chip and an antenna connected to it, made in the form of two symmetrical plate elements (patent US 6,147,606 G 08 B 13/14, publ. 14.11.2000).

The disadvantage of this device is that when it is placed on a metal surface, the reading distance is significantly reduced.

Closest to the claimed utility model is a device for radio-frequency identification of objects according to the patent US 6,215,402 G 08 B 13/14, publ. 04/10/2001

The prototype device contains an identification microcircuit and a microstrip antenna connected to it, comprising a lower conductive layer, an upper conductive layer and a dielectric layer disposed between them.

This device is a design with a significant increase in directivity. Labels of this kind are intended, inter alia, for placement on metal surfaces.

The disadvantage of the prototype is the availability of matching complex resistance, located between the identification chip and

microstrip antenna. The production of labels containing a matching scheme is difficult, and their material consumption and dimensions are relatively large.

When developing the claimed utility model, the task was to create an easy-to-manufacture and compact RFID identification tag for objects intended for placement on metal surfaces. When developing the claimed utility model, the task was also to expand the arsenal of technical means of radio-frequency identification of objects.

The technical result is an increase in manufacturability, a decrease in material consumption, a decrease in overall dimensions.

The claimed label for radio-frequency identification of objects contains an identification microcircuit and a microstrip antenna connected to it, comprising a lower conductive layer, an upper conductive layer and a dielectric layer disposed between them.

The claimed label differs from the prototype in that the identification chip is connected with its findings directly to the upper and lower conductive layers. In the claimed design does not use a matching scheme, because coordination is achieved by selecting the geometric dimensions of the antenna, at which the complex resistance of the identification chip and the complex resistance of the antenna can be matched at a frequency in the range of 0.86 ÷ 0.9 of the resonant frequency.

The identification microcircuit connected directly to the tag antenna has a complex resistance Z _IS = (10 ÷ 30) -j (410 ÷ 430) Ohm, consisting of the active part R _IS and the reactive part X _IS . The coordination and, thanks to it, the most efficient transfer of power from the antenna to the identification chip is achieved provided that the integrated resistance of the identification chip Z _is and the antennas Z _A are complex conjugate Z _is = Z * _A. A graph of the active R _A and reactive Z _A parts of the antenna resistance versus frequency is shown in FIG. 3.

The frequency range of matching 0.86 ÷ 0.9 of the resonant frequency is determined experimentally. The dependence of the modulus of the reflection coefficient on the frequency shown in figure 2. Frequency range matching antenna tags with identification

the chip is limited to frequencies at which the reflection coefficient does not exceed -20 dB, which corresponds to modern conditions for the use of labels.

The matching range in terms of reflection coefficient of not more than -20 dB lies within 846 ÷ 886 MHz, which with a resonant frequency of the antenna equal to 982 MHz is 0.86 ÷ 0.9 of the resonant frequency. The working frequency range of the mark is within the matching range, and the reflection coefficient in the working frequency range of the mark does not exceed -33 dB.

When the resistance change of the identification chip within Z _uc = (10 ÷ 20) -j (410 ÷ 430) reflection coefficient in the range 0.9 ÷ 0.86 of the resonant frequency is less than -20 dB, thus frequency band matching of the integrated circuit, having the complex resistance within Z _is = (10 ÷ 30) -j (410 ÷ 430) with the antenna resistance in terms of a reflection coefficient of -20 dB is 0.86 ÷ 0.9 of the resonant frequency.

The claimed label is designed to work in the frequency range 865 ÷ 869.65 MHz provided for by the European standards ETSI EN 300-220, ETSI EN 302-208.

List of drawings

Figure 1 - Label for radio-frequency identification of objects;

Figure 2 - Graph of the dependence of the coefficient of reflection coefficient on frequency;

Figure 3 - Graph of the active and reactive parts of the resistance of the antenna from frequency.

Utility Model Implementation

The label for radio-frequency identification of objects is presented in figure 1. The label contains a layer 1 of foamed dielectric material made of copper adhesive tape DK-101 upper 2 and lower 3 conductive layers and an identification chip Philips UCODE 4. Conclusions 5 of the identification chip 4 are soldered to the conductive layers 2, 3.

Label operating frequency range 865 ÷ 869.65 MHz (ETSI EN 300-220, ETSI EN 302-208 standards).

The integrated resistances of the microcircuit and antenna are matched at an operating frequency of 868 MHz. The resonant frequency is 982 MHz.

The integrated resistance of the identification chip Z _is = 12-j422 Ohms.

The complex resistance of the antenna Z _A = 23 + j419 Ohms.

Label dimensions: length 152 mm, width 20 mm, height 10 mm.

For the manufacture of the claimed device, only scissors and a soldering iron are needed. At the same time, as a prototype tag is made in industrial conditions, allowing the operation of chemical etching.

The label works as follows.

In order to ensure the identification of objects containing metal surfaces, an interested party, such as a manufacturer of goods or a trade organization, supplies each object (product, product, construction, etc.) with a radio frequency identification tag during its manufacture, or when it is transferred to a trading organization, or at its implementation.

The microstrip antenna provides the reception of a signal from the reader and the reverse transmission of individual information contained in the identification chip at a distance of 10 meters when using a 2 W reading module and an antenna with circular polarization and a gain of 8 dB connected to it. When you go beyond the limits of the matching range, there is a decrease in the reading distance by more than two times, which does not allow the use of the tag in modern identification systems.

When changing the real and imaginary part of the integrated resistance of the identification chip in the claimed range, the reflection coefficient does not exceed -20 dB. When going beyond the specified interval, in view of the deterioration of coordination, the reflection coefficient exceeds -20 dB, which also does not allow the use of the label in modern identification systems.

Claims (1)

Label for radio-frequency identification of objects, containing an identification microcircuit and a microstrip antenna connected to it, containing a lower conductive layer, an upper conductive layer and a dielectric layer placed between them, characterized in that the identification microcircuit is connected directly to the upper and lower conductive layers by its terminals, complex resistance identification microcircuit is located in the range (10 ÷ 30) -j (410 ÷ 430) Ohms and is consistent with the integrated resistance of the microbands antenna in the range of 0.86 ÷ 0.9 of its resonant frequency, and the operating frequency range of the label is 865 ÷ 869.65 MHz.